A pink flowered Snapdragon plant was crossed with a red flowered Snapdragon plant. What type of phenotype/s is/are expected in the progeny?
Correct Answer :
Red flowered as well as pink flowered plants
Solution :
The correct option is: Red flowered as well as pink flowered plants
Step-by-Step Explanation:
1. Understanding the Inheritance Pattern:
Flower color in Snapdragon (Antirrhinum majus) is a classic example of incomplete dominance. In this inheritance pattern, the heterozygous phenotype is an intermediate blend of the two homozygous phenotypes.
Let us define the alleles for flower color:
- Red flower allele: (or simply )
- White flower allele: (or simply )
2. Genotypes and Phenotypes:
- Homozygous red flowered plant:
- Homozygous white flowered plant:
- Heterozygous pink flowered plant:
3. Analyzing the Cross:
The question describes a cross between a pink flowered Snapdragon and a red flowered Snapdragon:
- Pink flower parent genotype: (produces and gametes)
- Red flower parent genotype: (produces only gametes)
4. Determining the Progeny (F1 Generation):
We can use a Punnett square to determine the expected genotypes and phenotypes of the offspring:
- Crossing gamete (from the red parent) with gamete (from the pink parent) gives: (Red flower)
- Crossing gamete (from the red parent) with gamete (from the pink parent) gives: (Pink flower)
5. Conclusion:
The expected progeny will consist of 50% red flowered plants () and 50% pink flowered plants (). Therefore, we expect to see red flowered as well as pink flowered plants in the progeny.
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